Here's take 2 on an object I virtually started my blog with. That's 200 posts ago. Yes, it's yet another big swirly nebulous thing! 6 x 2 minute exposures on the 20" newtonian at f/3 (focal reduced) with my astro modified Canon 1000D. Then I went back on a moonlit night, reassembled my focal reducer and got some flat fields. They made all the difference, even just as jpegs, which are pre-processed. Andy, you seriously have to try that man, it's a gas. You can see where I had to do my detrailing trick on the stars at the right hand side. This picture demonstrates the reason why you shouldn't expose for over a minute on a flipping "alt-az" when it's pointing high. Field rotation is the reason I focal reduce an already f/5 scope. I have over blurred the fainter regions in processing so I can enhance the contrast just a little bit more. The pretty object is a supernova remnant and what you are seeing is shock fronts as ripples expanding from what I guess is now a black hole or an inactive neutron star, but no one has been able to see much, just a little bit of hot metallic plasma. It all happened just a few thousand years ago, plus the 1500 years or so that it took the light to reach us.
Showing posts with label Veil nebula. Show all posts
Showing posts with label Veil nebula. Show all posts
Monday, 17 October 2011
Space ripples.
Here's take 2 on an object I virtually started my blog with. That's 200 posts ago. Yes, it's yet another big swirly nebulous thing! 6 x 2 minute exposures on the 20" newtonian at f/3 (focal reduced) with my astro modified Canon 1000D. Then I went back on a moonlit night, reassembled my focal reducer and got some flat fields. They made all the difference, even just as jpegs, which are pre-processed. Andy, you seriously have to try that man, it's a gas. You can see where I had to do my detrailing trick on the stars at the right hand side. This picture demonstrates the reason why you shouldn't expose for over a minute on a flipping "alt-az" when it's pointing high. Field rotation is the reason I focal reduce an already f/5 scope. I have over blurred the fainter regions in processing so I can enhance the contrast just a little bit more. The pretty object is a supernova remnant and what you are seeing is shock fronts as ripples expanding from what I guess is now a black hole or an inactive neutron star, but no one has been able to see much, just a little bit of hot metallic plasma. It all happened just a few thousand years ago, plus the 1500 years or so that it took the light to reach us.
Saturday, 5 June 2010
Outcast shockwave
In the deep blue summer midnight sky, we were panning around the Veil Nebula using the 20-inch, which is a superb telescope for this sort of visual application. Using my wide field 20 mm eyepiece and a Lumicon UHC (Ultra High Contrast) nebular filter, the strands of nebulosity from this supernova remnant were standing out from the twilight background. After looking at the weird ethereal strands around 52 Cygni, we moved across to NGC 6992 and 6995 on the opposite side and followed this arc as far as possible. I came across what I thought was a faint blob well separated from the rest and was curious to confirm whether this was real or just my imagination. So I stuck the Canon onto the scope. I keep the focuser locked in position for the Camera and slide the eyepiece in and out for visual focus, so this was very quick. I got a few 30” pics and stacked to reveal this lonely, outcast piece of supernova remnant.
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